Broken deck.
Treacherous is preferred over E-con btw, because Final Battle is technically Continuous. It helps with Ancient gear matchup, alongside Final Battle.
Also Ties of the Brethren can be used as a Nemesis Warrior searcher. It’s a level 4 EARTH Warrior, we have many of those.
Ties seems pretty terrible in Subterror. Running cards like D.D. Assailant just for it seems... Bad. Stuff like Dust Knight or Burrowing (plus a way to pop it) are better, and still suck. Heck, even Neos Fusion and Red-Eyes Fusion are probably better than Ties.
I don't really like the idea of using Ties of the Brethren: you get 3 monsters on the field, which means your opponent can always Summon Lava Golem and you also have to pay 2000 Life Points in order to activate it, which makes your opponent's job easier.
If you turn on the toggle and set it to on, you can activate Nemesis to summon Ultramalfus before the opponent has the chance to use Lava Golem. Its defense is pretty low, but with Final Battle or even Desert Sun, that's not a problem as it flips all other monsters face down upon summon.